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| Cast |
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| Dr Feodor Orloff | LUGOSI, Bela |
| Inspector Holt | WILLIAMS, Hugh |
| Diana Stuart | GYNT, Greta |
| Lieutenant O'Reilly | RYAN, Edmon |
| Jake | WALTER, Wilfred |
| Grogan | FIELD, Alexander |
| [secretary] | SUEDO, Julie |
| [dumb Lew] | OWEN, Arthur E. |
| [Henry Stuart] | PRING, Gerald |
| [drunk] | PENROSE, Charles |
| [Walsh] | HERBERT, Brian |
| [policewoman] | HALLATT, May |
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| Credits |
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| Director | SUMMERS, Walter |
| Producer | ARGYLE, John F. |
| Production Company | John Argyle Productions |
| Studio | Welwyn Studios |
| Adapted from the book by | WALLACE, Edgar |
| Screenplay | KIRWAN, Patrick |
| Screenplay | SUMMERS, Walter |
| Screenplay | ARGYLE, John F. |
| Additional Dialogue | VAN LUSIL, Jan |
| Music composed and arranged | JONES, Guy |
| Organ Music by | PALMER, C. King |
| Production Manager | INGLIS, Hamilton G. |
| Production Assistant | COLLINS, George |
| Photography | LANGLEY, Bryan |
| Recording Supervisor | BENSON, Harry |
| Sound Recording | RUDOLPH, A.E. |
| Editor | RICHARDS, E.G. |
| Art Director | SUTHERLAND, Duncan |
| Camera | ANSCOMBE, Ronnie |
| Assistant Director | MARTIN, Jack |
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